Class: ActiveHarness::Pipeline

Inherits:
Object
  • Object
show all
Defined in:
lib/active_harness/pipeline.rb,
lib/active_harness/pipeline/step.rb,
lib/active_harness/pipeline/hooks.rb

Overview

Sequential pipeline that chains agents and tribunals. Each step receives the current payload and can transform it or stop the pipeline.

Usage (subclass with DSL):

class SupportPipeline < ActiveHarness::Pipeline
  step :injection_guard do
    use InjectionGuardAgent
    stop_if ->(result) { result.parsed["detected"] == true }
  end

  step :translate, TranslationAgent   # shorthand — no stop_if

  step :safety_tribunal do
    use SafetyTribunal
    stop_if ->(result) { result.verdict == false }
  end

  on :before_step do |step_name, payload| ... end
  on :after_step  do |step_name, result|  ... end
  on :before_step, :translate do |payload| ... end
  on :after_step,  :translate do |result|  ... end
  on :stopped  do |step_name, result| ... end
  on :complete do |last_result|       ... end
end

pipeline = SupportPipeline.new(input: "...", context: { user_id: 1 })
pipeline.call
pipeline.output       # => final payload string (nil if stopped)
pipeline.stopped?     # => false
pipeline.step_results # => { translate: <Result>, ... }

Direct Known Subclasses

SupportPipeline

Defined Under Namespace

Classes: Step

Constant Summary collapse

VALID_HOOKS = 
%i[before_step after_step stopped complete].freeze
VALID_STEP_HOOKS = 
%i[before_step after_step].freeze

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(input:, context: {}, memory: nil, streams: {}) ⇒ Pipeline

Returns a new instance of Pipeline.



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# File 'lib/active_harness/pipeline.rb', line 78

def initialize(input:, context: {}, memory: nil, streams: {})
  @original_input        = input
  @payload               = input
  @context               = context.dup
  @memory                = memory
  @token_stream          = streams[:token]
  @agent_event_stream    = streams[:agent]
  @tribunal_event_stream = streams[:tribunal]
  @pipeline_event_stream = streams[:pipeline]
  @step_results          = {}
  @stopped               = false
  @stopped_at            = nil
  @stop_reason           = nil
  @execution_time        = nil
  @output                = nil
end

Instance Attribute Details

#context ⇒ Object

Instance API



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# File 'lib/active_harness/pipeline.rb', line 69

def context
  @context
end

#execution_time ⇒ Object (readonly)

Instance API



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# File 'lib/active_harness/pipeline.rb', line 69

def execution_time
  @execution_time
end

#original_input ⇒ Object (readonly)

Instance API



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# File 'lib/active_harness/pipeline.rb', line 69

def original_input
  @original_input
end

#output ⇒ Object (readonly)

Instance API



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# File 'lib/active_harness/pipeline.rb', line 69

def output
  @output
end

#step_results ⇒ Object (readonly)

Instance API



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# File 'lib/active_harness/pipeline.rb', line 69

def step_results
  @step_results
end

#stop_reason ⇒ Object (readonly)

Instance API



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# File 'lib/active_harness/pipeline.rb', line 69

def stop_reason
  @stop_reason
end

#stopped_at ⇒ Object (readonly)

Instance API



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# File 'lib/active_harness/pipeline.rb', line 69

def stopped_at
  @stopped_at
end

Class Method Details

.after(event, step_name = nil, &block) ⇒ Object 



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# File 'lib/active_harness/pipeline/hooks.rb', line 50

def after(event, step_name = nil, &block)
  on(:"after_#{event}", step_name, &block)
end

.before(event, step_name = nil, &block) ⇒ Object

Rails-style aliases for on:

Global:

before :step                          do |name, payload| end  # → on :before_step
after  :step                          do |name, result|  end  # → on :after_step
callback :stopped                     do |name, result|  end  # → on :stopped
callback :complete                    do |result|        end  # → on :complete

Per-step:

after  :step, :translate              do |result| end
before :step, :translate              do |payload| end



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# File 'lib/active_harness/pipeline/hooks.rb', line 46

def before(event, step_name = nil, &block)
  on(:"before_#{event}", step_name, &block)
end

.callback(event, &block) ⇒ Object 



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# File 'lib/active_harness/pipeline/hooks.rb', line 54

def callback(event, &block)
  on(event, &block)
end

.inherited(subclass) ⇒ Object

Each subclass gets its own isolated config.



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# File 'lib/active_harness/pipeline.rb', line 58

def inherited(subclass)
  subclass.instance_variable_set(
    :@pipeline_config,
    { steps: [], hooks: {}, step_hooks: {} }
  )
end

.on(event, step_name = nil, &block) ⇒ Object

Register a global or per-step hook.

Global hooks fire on every step:

on :before_step do |step_name, payload| ... end
on :after_step  do |step_name, result|  ... end
on :stopped     do |step_name, result|  ... end
on :complete    do |last_result|         ... end

Per-step hooks fire only for the named step (no step_name passed):

on :before_step, :translate do |payload| ... end
on :after_step,  :translate do |result|  ... end



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# File 'lib/active_harness/pipeline/hooks.rb', line 18

def on(event, step_name = nil, &block)
  if step_name
    unless VALID_STEP_HOOKS.include?(event)
      raise ArgumentError,
        "Per-step hooks support: #{VALID_STEP_HOOKS.join(", ")}. Got :#{event}"
    end
    pipeline_config[:step_hooks][step_name] ||= {}
    pipeline_config[:step_hooks][step_name][event] = block
  else
    unless VALID_HOOKS.include?(event)
      raise ArgumentError,
        "Unknown Pipeline hook :#{event}. Valid: #{VALID_HOOKS.join(", ")}"
    end
    pipeline_config[:hooks][event] = block
  end
end

.pipeline_config ⇒ Object 



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# File 'lib/active_harness/pipeline.rb', line 53

def pipeline_config
  @pipeline_config ||= { steps: [], hooks: {}, step_hooks: {} }
end

.step(name, agent_class = nil, &block) ⇒ Object

Define a step in the pipeline.

Shorthand (agent only, no stop_if):

step :translate, TranslationAgent

Full block form:

step :injection_guard do
  use InjectionGuardAgent
  stop_if ->(result) { result.parsed["detected"] == true }
end



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# File 'lib/active_harness/pipeline.rb', line 49

def step(name, agent_class = nil, &block)
  pipeline_config[:steps] << Pipeline::Step.new(name, agent_class, &block)
end

Instance Method Details

#call ⇒ Object

Execute all steps sequentially. Returns self for chaining.



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# File 'lib/active_harness/pipeline.rb', line 100

def call
  config = self.class.pipeline_config
  t0     = Process.clock_gettime(Process::CLOCK_MONOTONIC)

  @memory&.load

  config[:steps].each do |step|
    fire(:before_step, step.name, @payload, config)
    fire_step(:before_step, step.name, @payload, config)

    result = execute_step(step)

    @step_results[step.name] = result
    @context[step.name]      = result
    @payload                 = result.output if step.transform?

    fire(:after_step, step.name, result, config)
    fire_step(:after_step, step.name, result, config)

    if step.stop_if && step.stop_if.call(result)
      @stopped     = true
      @stopped_at  = step.name
      @stop_reason = result
      blk = config[:hooks][:stopped]
      instance_exec(step.name, result, &blk) if blk
      @pipeline_event_stream&.call(:stopped, step.name, result)
      break
    end
  end

  @execution_time = (Process.clock_gettime(Process::CLOCK_MONOTONIC) - t0).round(3)
  @output         = @payload unless @stopped

  unless @stopped
    @memory&.record(
      request:  @original_input,
      response: @output,
      pipeline: self.class.name
    )

    last_result = @step_results[@step_results.keys.last]
    blk = config[:hooks][:complete]
    instance_exec(last_result, &blk) if blk
    @pipeline_event_stream&.call(:complete, last_result)
  end

  self
end

#input=(value) ⇒ Object 



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# File 'lib/active_harness/pipeline.rb', line 73

def input=(value)
  @original_input = value
  @payload        = value
end

#stopped? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/active_harness/pipeline.rb', line 95

def stopped?
  @stopped
end